Child Car Seat Fit Calculator

Child Car Seat Fit Calculator. Car seat safety guidelines change as children grow, and choosing the wrong seat type can leave your child unprotected in a crash. Enter your child's age, weight, height, and whether your vehicle has a lap-and-shoulder belt into the Child Car Seat Fit Calculator to get the recommended car seat type for your child right now. You'll also see a Safety Compliance Score, an age appropriateness rating, and the next car seat milestone to plan ahead for. Also try the use the Vehicle Center of Gravity Calculator.

Results

Recommended Car Seat Type

Safety Compliance Score

Age Appropriateness

Next Car Seat Milestone

Is Your Child in the Right Car Seat?

The right car seat depends on your child's age, weight, and height. Our calculator follows NHTSA guidelines to recommend rear-facing infant seats, convertible seats, or booster seats based on your child's current measurements and development stage. See also our Braking Distance Calculator.

How accurate are the car seat recommendations?

Our recommendations are based on official NHTSA guidelines and safety standards. However, always check your specific car seat manufacturer's guidelines and consult with a certified Child Passenger Safety Technician for personalized advice.

When should my child transition to the next car seat type?

Children should transition when they outgrow their current seat by height or weight limits, or reach the maximum age recommendation. Generally, keep children rear-facing until at least age 2, and in booster seats until the seat belt fits properly.

What if my vehicle only has a lap belt?

If your vehicle only has lap belts, you'll need a car seat that can be safely installed with just a lap belt. Many newer booster seats require lap and shoulder belts, so convertible seats or specific booster models may be necessary.

Can I use this calculator for any car seat brand?

Yes, our calculator provides general recommendations based on safety guidelines that apply to all car seat brands. However, always verify that your specific car seat model supports your child's measurements and your vehicle type.

What if I still feel unsure after seeing my results?

If you're uncertain about the recommendation, consult with a Certified Child Passenger Safety Technician (CPST) in your area. Many offer free inspections and can provide hands-on guidance for your specific situation.

How often should I check if my child needs a new car seat?

Check your child's fit every few months, especially during growth spurts. Children typically outgrow car seats by height before weight, so measure regularly and watch for signs like the top of their head approaching the seat's height limit. You might also find our Cross Weight Percentage — Corner Weight useful.